Question

What is n^2 -5n if n=n-4​

Answer 1

n^2 - 5n = -12

Explanation:

so

4^2 = 8

and

5*4 = 20

8-20 = -12

Answer 2

`n^(2)-13n+36`

Explanation:

`n^(2) -5n\ -> we\ make\ substitution\ n-4\ instead\ of\ n\\(n-4)^(2) - 5(n-4) = n^(2) + 16 - 8n-5n+20 = n^(2)-13n+36`